SVs are usually pretty good for valve clearance. As long as it hasn't been constantly redlined or REALLY high mileage I wouldn't worry about it that much. Therefore, I wouldn't think twice about purchasing a 20-30K km bike.
A bonus would be new chain and tires which is possible with that kinda mileage.
The suspension is the weakest link, especially the non-adjustable front BUT for normal, everyday driving it's fine. If you intend to push it hard (like track), it will feel mushy and an upgrade is recommended. A lot of people swap in older GSX-R front ends.
As for model years, I don't think there were ANY changes whatsoever from 1999 to 2002. For the 2nd gen, there were numerous ones, on the other hand, from year to year.
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